New "Best Hope" for Quantum Gravity?

          @misc{ pirsa_PIRSA:11020085,
            doi = {10.48660/11020085},
            url = {https://pirsa.org/11020085},
            author = {Loll, Renate},
            keywords = {Quantum Gravity},
            language = {en},
            title = {New \"Best Hope\" for Quantum Gravity?},
            publisher = {Perimeter Institute},
            year = {2011},
            month = {feb},
            note = {PIRSA:11020085 see, \url{https://pirsa.org}}
          }
          

Abstract

How many interacting quantum (field) theories of four-dimensional geometry are there which have General Relativity as their classical limit? Some of us still harbour hopes that a quantum theory of gravity is "reasonably unique", i.e. characterized by a finite number of free parameters. One framework in which such universality may manifest itself is that of "Quantum Gravity from Causal Dynamical Triangulations (CDT)". I will summarize the rationale behind this nonperturbative formulation and CDT's main achievements in trying to explain the micro- and macro-structure of spacetime from first principles. This includes the remarkable property of "dynamical reduction" of the spacetime dimension from four to two at the Planck scale.